Revert of skia: Add 'skia_unittests' test suite for this directory.

testing/buildbot/chromium.chromiumos.json

 {
   "Linux ChromiumOS Tests (1)": {
     "gtest_tests": [
       "accessibility_unittests",
       {
         "test": "base_unittests",
         "swarming": {
           "can_use_on_swarming_builders": true
         }
       },
@@ skipping 71 matching lines @@
         "test": "unit_tests",
         "swarming": {
           "can_use_on_swarming_builders": true
         }
       },
       "sql_unittests",
       "nacl_loader_unittests",
       "athena_unittests",
       "app_shell_browsertests",
       "app_shell_unittests",
-      "chromevox_tests",
-      "skia_unittests"
+      "chromevox_tests"
     ]
   },
   "Linux ChromiumOS Ozone Tests (1)": {
     "gtest_tests": [
       "accessibility_unittests",
       "app_list_unittests",
       "app_shell_browsertests",
       "app_shell_unittests",
       "ash_unittests",
       "athena_unittests",
@@ skipping 39 matching lines @@
         }
       },
       "ozone_unittests",
       "ppapi_unittests",
       "printing_unittests",
       "remoting_unittests",
       {
         "test": "sandbox_linux_unittests",
         "args": ["--test-launcher-print-test-stdio=always"]
       },
-      "skia_unittests",
       "sql_unittests",
       "sync_unit_tests",
       "ui_base_unittests",
       "ui_chromeos_unittests",
       "ui_touch_selection_unittests",
       {
         "test": "unit_tests",
         "swarming": {
           "can_use_on_swarming_builders": true
         }
@@ skipping 81 matching lines @@
       "app_shell_unittests",
       {
         "test": "content_browsertests",
         "swarming": {
           "can_use_on_swarming_builders": true,
           "shards": 2
         }
       },
       "athena_unittests",
       "gcm_unit_tests",
-      "skia_unittests",
       {
         "test": "interactive_ui_tests",
         "swarming": {
           "can_use_on_swarming_builders": true,
           "shards": 3
         }
       }
     ]
   }
 }